William n



(No Model.)

W. N.'BARROWS. Apparatus for Molding Shells.

NO. 230,916. Patented Aug.10,1880.

myz. F ya I III. llfllli Z IIAIIIIZZ TATES UNITE WILLIAM N. BARROVVS, OFPHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HENRY J. HAND, OF SAME PLACE.

APPARATUS FOR MOLDING SHELLS.

SPECIFICATION forming part of Letters Patent No. 230,916, dated August10, 1880.

Application filed April 16, 1880.

To all whom it may concern Be it known that I, WILLIAM NELsoN BAR- ROWS,of the city and county of Philadelphia, and State of Pennsylvania, haveinvented a certain new and useful improvement in apparatus for moldingcastings, specially useful for molding shells for ordnance, and shot andballs used for the welding of lapwelded tubes, and any kind of castingin which correct and I0 accurate circular form is specially desirable;and I do hereby declare the following to be 'asufficiently full, clear,and exact description thereof to enable others skilled in the art tomake and use the said invention. My invention relates to that class ofmolds formed of sand rammed around a pattern, which pattern is afterwarddrawnor retracted by a guiding or guided mechanism; and has for itsobject a greater facility of evenly and uniformly ramming the mold, ofeffectively venting the mold, and more uniform strength or resistance ofthe mold to straining from the pressure of the molten metal, so that thecastings produced are of more nearly accurate geometric form.

The nature of my invention consists in flask containing one or morechambers whose walls are equidistant from the pattern and provided withgrooves or recesses in which sand is placed not so highly rammed as inthe body of the mold, and in which grooves blades or tapering needleswork in forming vent-channels; also, in combining the venting needles orblades with the mechanism for drawing or retracting the pattern; and,lastly, in the employment, in conjunction with a flask-pattern andneedles, as above stated, of a mixture of sand and agglutinating-fluidwhich ,when dried after the withdrawal of the pattern, presents a 40smooth accurately-shaped hard surface to the molten metal.

I will now proceed more particularly to describe my invention, referringin so doing to the drawings annexed and the letters of reference markedthereon.

Figure 1 shows a plan of the flask-pattern and molding-machine whenempty. Fig. 2 shows a vertical section of the machine and flask with thepattern and sand contained therein. Fig. 3 shows a vertical section ofthe (No model.)

machine with the flask afterthelatter has been rammed up and the patternand venting-blades withdrawn; and Fig. at shows a vertical section of acompleted mold containing the core ready to be poured off or filled withmolten metal. Figs. 5, 6, and 7 show plans of multiple-molds or moldscontaining clusters of patterns which may be used in casting smallarticles.

The same letters of reference apply to the same parts in the severalfigures.

A represents the pattern; B, the metallic frame or flask which surroundsit, having its side equidistant at all points from the pattern A, andhaving grooves or channels 0, formed with their open side D toward thepattern A.

' E is the sand mixed with an agglutinatiugfluid. F are tapering ventingblades or needles, the smaller ends of which are upward.

G is a horizontal plate upon which the bottom of the flask B rests, andon which it is held in position by dowel-pins H and lugs J. Through theplate G are apertures in which accurately fit the pattern A and needlesF when up, and through which they can be dropped or withdrawn.

, The pattern A and needles F are fastened at their lower ends to aframe, K, working smoothly and accurately in a vertical direction inguides L and M, by a lever, N, and link 0; or it may be raised by a rackand pinion or toothed sector or segment or a cam.

The apparatus is operated in the following manner: The flask B is placedin position wit-h the lugs J upon the dowel-pins H, and the pattern Aand needles F are raised and held up in the position shown in Fig. 2.Saudis then filled into the flask and rammed evenly therein by a rammerwhose sides are shaped to conform to the curve of theinternal surface ofthe 0 flask B, the pattern and needles then withdrawn by lowering theframe K, leaving sand in the mold compactly and evenly pressed in theshape of the pattern, while the sand in the grooves or channels 0 islooser and more open 5 and has channels or vent-passages extending -fromthe under side of the mold up through it.

2. The flask B, provided with channels 0 for retaining sand without thereach of the ramm er in molding, as and for the purpose set forth.

3. The combination of tapering vent-needles F, with the guided pattern,drawing-frame K, and flask 13, having channels 0, as and for the purposeset forth.

WM. N BARROW S.

Witnesses:

ALEX. H. SIEG L, J. DANIEL EBY.

